ANN is usually divided into two kinds: one is the feed-forward neural networks (i.e. no feedback neural networks), the other is recurrent neural networks (RNN) (i.e. feedback neural networks).

• 人工神经网络通常分为两类；一类是前馈神经网络（即没有反馈的神经网络）；另一类是递归神经网络（即有反馈的神经网络）。